A134 alarm in WEG CFW900 Drive indicates a Bus Off condition on the CAN interface. This means the network experienced too many data errors and isolated itself from the bus to prevent further issues.
Cause:
Bus off error detected on the CAN interface.
- Verify if there is any short-circuit between the CAN circuit transmission cables.
- Verify if the cables have not been changed or inverted.
- Verify if all the network devices use the same baud rate.
- Verify if termination resistors with the correct values were installed only at the extremes of the main bus.
- Verify if the CAN network was properly installed.
Remedy:
Verify CAN cabling polarity and check for line shorts. Match network node baud rates. Check termination resistor locations. Cycle power to reestablish communications.
